Which option is not a valid method to assign the lowest-order 64-bit field of an IPv6 unicast
address?

A.
ARP

B.
manual assignment

C.
DHCPv6

D.
auto-configured based on the 48-bit MAC address

E.
auto-generated pseudo-random number

Explanation:
I concluded, and quickly confirmed that there’s no such thing as ARP in IPv6 – so
how do hosts find each other on a network? During the course of my studies, I learned that many
functions like this were wrapped under the umbrella of IPv6 Neighbor Discovery, which runs on
ICMPv6. The function of ARP is replaced in IPv6 by Neighbor Solicitation messages. I’d like to
deep dive for a minute or two and explain exactly how this works.